Identification of excimer delayed fluorescence by Protoporphyrin IX: A novel access to local chromophore concentration?

Croizat, Gauthier; Gregor, Aurélien; Joniová, Jaroslava; Gerelli, Emmanuel; Wagnières, Georges

doi:10.1016/j.jphotobiol.2022.112408

Cited by 3 publications

(4 citation statements)

References 43 publications

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“…The absorption bands of CS–PPIX closely match those found for PPIX. These electronic transitions are typical of PPIX dissolving in organic solvents . Therefore, CS–PPIX retains the UV–visible absorption spectroscopic properties of the porphyrin-based chromophores, suggesting a minimal interaction between the tetrapyrrolic macrocycle and the CS polymeric matrix.…”

Section: Resultsmentioning

confidence: 92%

“…These electronic transitions are typical of PPIX dissolving in organic solvents. 51 Therefore, CS−PPIX retains the UV−visible absorption spectroscopic properties of the porphyrin-based chromophores, suggesting a minimal interaction between the tetrapyrrolic macrocycle and the CS polymeric matrix. The Soret bands of CS−PPIX and PPIX are hypsochromically shifted by 14 nm compared to that of TMAP 4+ .…”

Section: Sem Images Of the Cs−ppix Conjugatementioning

confidence: 99%

“…The fluorescence profile of the CS−PPIX conjugate exhibits distinctive emission bands at 633 and 700 nm, indicative of the characteristic features of PPIX. 51 The emission bands originating from the porphyrin unit were attributed to the Q x (0−0) and Q x (0−1) transitions.…”

Section: Sem Images Of the Cs−ppix Conjugatementioning

confidence: 99%

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Development of New Photoinactivation Strategies for Microbial Decontamination in Fruits and Packaging

Larrea,

Gsponer,

Durantini

et al. 2023

ACS Food Sci. Technol.

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The consumption of fruits and vegetables in the daily diet is an adequate condition for obtaining a healthy life. Therefore, decontamination is crucial to reducing the appearance of potentially dangerous microorganisms in these foods. In this work, a conjugate (CS−PPIX) of natural origin was synthesized from the covalent union of protoporphyrin IX (PPIX) and chitosan (CS) by amide bonds. This photosensitizer was developed to reduce the microbial load in fruits and food packaging through the photodynamic inactivation of microorganisms (PDI). A film of CS−PPIX showed an appreciable contact surface. The conjugation of PPIX to CS was confirmed by IR spectra. The absorption and emission spectra of the conjugate exhibited the characteristic PPIX bands, accompanied by a fluorescence quantum yield of 0.10. Photodynamic investigation indicated that CS−PPIX produced singlet molecular oxygen (Φ Δ = 0.40) in solution. Also, this compound was able to generate superoxide anion radicals with the assistance of the reductant nicotinamide adenine dinucleotide and efficiently photo-oxidize the amino acid L-tryptophan. PDI in vitro experiments were performed with the Gram-positive bacterium Staphylococcus aureus. Bacteria were eliminated (>99.9999% reduction in survival) when cell suspensions were treated with 1 μM CS−PPIX upon 30 min of irradiation with white light. Furthermore, no microbial growth was detected in cells immobilized on agar surfaces in the CS−PPIX-treated areas. Therefore, the PDI approach was evaluated to reduce the contamination of S. aureus on fruit surfaces and food containers. After treating the surfaces of apple and pear pieces with 10 nmol of CS−PPIX, a greater than 99.9% reduction in bacterial survival was observed upon an irradiation of 30 min. This conjugate was also effective in the photodynamic decontamination of polyethylene bags and polyethylene terephthalate packaging materials. Therefore, the CS−PPIX conjugate presents adequate properties to reduce the microbial load and preserve fresh foods.

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Section: Resultsmentioning

confidence: 92%

Section: Sem Images Of the Cs−ppix Conjugatementioning

confidence: 99%

See 1 more Smart Citation

Development of New Photoinactivation Strategies for Microbial Decontamination in Fruits and Packaging

Larrea,

Gsponer,

Durantini

et al. 2023

ACS Food Sci. Technol.

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show abstract

“…As the most common porphyrin derivative, PpIX is a water-soluble sodium salt that can be extracted from hemoglobin. , The characteristic structure of a tetrapyrrole large ring is the photoaction center of PpIX, which has a strong visible light absorption ability . When PpIX is excited by light, part of the PpIX returns to the ground state and part of the PpIX converts energy with the surrounding molecular oxygen in the ground state to produce a large amount of singlet oxygen. , PpIX is widely used in antibacterial, , antitumor, , and biological imaging , and in other fields due to its high photoactivity, low toxicity, high safety, and fast metabolism.…”

Section: Introductionmentioning

confidence: 99%

Light-Responsive Fluorescent Security Ink Based on Calixpyridinium–Protoporphyrin IX Disodium Salt Supramolecular Nanoassemblies

Wang

Liu

Gao

et al. 2023

ACS Appl. Nano Mater.

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In this work, the coordination effects of protoporphyrin IX disodium salt (PpIX) with CuII, FeII, and ZnII were systematically studied, and the host–guest interactions of calixpyridinium with PpIX and the three metalloporphyrins were further explored. The bonding ratio between calixpyridinium and PpIX was different from that between calixpyridinium and the other three metalloporphyrins. The reduction of the electronegativity of PpIX caused by the coordination of metal cations may be the reason for the change of the bonding ratio. The reduction of the electronegativity of PpIX caused by the coordination of metal cations also leads to a weaker host–guest interaction with calixpyridinium. The supramolecular nanoassemblies prepared by the host–guest interactions of calixpyridinium with PpIX and the three metalloporphyrins under alkaline conditions could emit a bright fluorescence due to the pH-dependent luminescence characteristics of calixpyridinium and PpIX. Among calixpyridinium and the three metal ions, calixpyridinium alone had the best effect on promoting the photoactivity of PpIX. Its fluorescence gradually disappeared after being irradiated by an incandescent lamp not only in aqueous solution but also on a filter paper. More interestingly, the supramolecular nanoassemblies formed by calixpyridinium and the photoreaction product of PpIX had a reversible temperature responsiveness, which could lead to a reversible fluorescence on–off control. As a result, this material was successfully applied as an intelligent light-responsive fluorescent security ink.

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Changes in tenderness of beef M. semitendinosus and modification of actomyosin mediated by Fe(III)-protoporphyrin IX, protoporphyrin IX and free iron

Zhang,

Shi,

Shu

et al. 2024

LWT

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Identification of excimer delayed fluorescence by Protoporphyrin IX: A novel access to local chromophore concentration?

Cited by 3 publications

References 43 publications

Development of New Photoinactivation Strategies for Microbial Decontamination in Fruits and Packaging

Development of New Photoinactivation Strategies for Microbial Decontamination in Fruits and Packaging

Light-Responsive Fluorescent Security Ink Based on Calixpyridinium–Protoporphyrin IX Disodium Salt Supramolecular Nanoassemblies

Changes in tenderness of beef M. semitendinosus and modification of actomyosin mediated by Fe(III)-protoporphyrin IX, protoporphyrin IX and free iron

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